[crankaholic]

Well my Rotiform SPF wheels and Eibach spacers arrived today finally!

I'll be doing a test fit around 4PM EST and will post photos then.

Wheels

• Rotiform SPF
• 19x8.5
• +35 offset (ET35)

Spacers

• Eibach system 4
• 15mm

Tires

• Dunlop SP Winter Sport 3D XL
• 245/45R19

[Bitchin' Camaro]

Looks good. I also have some 15mm spacers to use with some wheels I already have. 19X9.5 ET36 in my case.

Your wheels with spacers should look good. What I call poke, how much the wheels poke out from the hub flange.

The OEM SS wheels poke out 83mm front, 82mm rear.

ZL1 wheels I've seen put on a gen6 poke out 104mm front, 97mm rear. They look really good in the pics.

Yours should poke 88mm.

The wheels I've got should poke 100mm front and rear with the 15mm spacers.

But I have one concern: When you have the wheel off, could you measure the wheel stud length? I'm wondering if the pockets in the backside of my extra wheels will be large enough for the spacer nut and excess wheel stud.

Thanks!

Oh, I'd do it myself but my car isn't scheduled to be built until next week....

[Bassment]

Did you buy spacers just for aesthetics? Or do you need them to clear the brakes?

[Bitchin' Camaro]

Originally Posted by Bassment

Did you buy spacers just for aesthetics? Or do you need them to clear the brakes?

Your probably asking the OP, but FWIW in my case (and I'm killing time until leaving work) it is for fit as well as aesthetics.

I'm kinda running blind since I don't have a car to check things on yet but inferring from what others have found to fit, and knowing the specs.....

Poke is how much of the wheel sit outside of the hub flange and inset is the opposite, how much of the wheel sits to the inside. Too much poke and you'll foul on the fenders. Too much inset and you'll foul on the shock/strut/suspension. Also, my numbers are to where the tire sits on the wheel, not the outside of flange and don't account for the tire sidewall bulge. But it's easy to compare wheel to wheel. If you know what fits, you can get an idea of how much room there is to work with.

OE Front poke=83, inset=133
OE Rear poke=82, inset=160 (OE rears will not fit on the front per ? this forum)
ZL1 Front poke=104, inset=150
ZL1 Rear poke=97, inset=183

ZL1 front fits, so somewhere between an inset of 150-160 is where you start hitting suspension on the front (this is assuming that the reports are correct that a OE rear does not fit on the front and a ZL1 front wheel does). I think the stance of the car with ZL1 wheels is pretty awesome. So for me it comes down to a poke number somewhere between the OE and ZL1 but with an inset less than the ZL1.

[crankaholic]

Test fit happened later than expected... damn work...

The wheels clear the 6-piston brakes perfectly - there's about 0.5" clearance between the caliper and both the wheel spokes and rim.

The spacers fit the hub perfectly as well - they are 66.5mm hub-bore.

However, the OEM studs don't clear the wheel hub when used with the spacers I have two options here - buy and install shorter studs or drill out a bit of the wheel hub. I'll probably end up drilling the wheel (a few millimeters) - it'll be cheaper in the end and I don't have to change the studs just for a set of winter wheels/tires.

The hub-rings I bought in 67.1mm are too loose actually - I read our hubs are 67mm in a previous thread, but it seems that they're 66.5mm like on the gen5. I'll be exchanging the rings I have for a set that fits.

The wheels actually fit close enough to stock (like Bitchin' Camaro pointed out) that I'll try mounting the set without spacers and go from there.


Here are pics of the front wheel as it sits without spacers:

[crankaholic]

Originally Posted by Bassment

Did you buy spacers just for aesthetics? Or do you need them to clear the brakes?

I mainly bought them for aesthetics... but I was also worried that a 19" wheel might not clear the brakes if it sat a bit further in (~10mm) than stock. Brake clearance isn't an issue at all, but I still love the look of flush-fitting* wheels.


*not to be confused with "hellaflush"

[Glen e]

Very nice looking, they will still look basicaly clean when dirty..... Good thinkin

[crankaholic]

Originally Posted by Glen e

Very nice looking, they will still look basicaly clean when dirty..... Good thinkin

Thank you. Precisely... I wanted something that I didn't have to clean every week

[crankaholic]

Originally Posted by Bitchin' Camaro

But I have one concern: When you have the wheel off, could you measure the wheel stud length? I'm wondering if the pockets in the backside of my extra wheels will be large enough for the spacer nut and excess wheel stud.

Forgot to write it down I'll need that measurement for when I get the wheel hubs drilled out. I'll be putting the wheels on, without spacers, tomorrow or Saturday - will measure how far the bolts stick out then, there's no good way to measure the whole stud without taking it out completely though.

[Bitchin' Camaro]

Originally Posted by crankaholic

Forgot to write it down I'll need that measurement for when I get the wheel hubs drilled out. I'll be putting the wheels on, without spacers, tomorrow or Saturday - will measure how far the bolts stick out then, there's no good way to measure the whole stud without taking it out completely though.

Thanks. That what I'm wondering, just how much sticks out not the whole stud. I'll probably have the same problem as you unfortunately. I also bought some 67.1mm hub rings. Damn.

[Denis]

oh those are gonna look nice! and I like how the brakes fill the whole wheel up. nice winter package fore sure.

[Bitchin' Camaro]

What are the specs on your spacers? I bought ones for a Cadillac ATS-V and they are spec'd as 66.9 CB

http://www.ebay.com/itm/231446942439

Are you returning your spacers for 66.5. Actually I think there is a slight tolerance. I've found 66.6mm hub centric adapters and 67.1mm. I think that would correlate with 66.5 and 66.9 CB.

So I've got 66.9mm CB spacers and 67.1mm hub centric rings and both may be not correct......

[crankaholic]

Originally Posted by Bitchin' Camaro

What are the specs on your spacers? I bought ones for a Cadillac ATS-V and they are spec'd as 66.9 CB

http://www.ebay.com/itm/231446942439

Are you returning your spacers for 66.5. Actually I think there is a slight tolerance. I've found 66.6mm hub centric adapters and 67.1mm. I think that would correlate with 66.5 and 66.9 CB.

So I've got 66.9mm CB spacers and 67.1mm hub centric rings and both may be not correct......

The snowpocalypse here is in full effect... and I didn't have time to go to a shop before everyone closed (early) on Friday :( I'll measure the studs, try a full fit of the spacers and install the wheels/tires as they are on Tuesday/Wednesday.

The spacers I got are 66.5mm center bore and the new hub rings are 66.56mm... the spacers are probably around 66.56mm - the fit is very tight, you have to use a rubber mallet to install them.

67.1mm is definitely too large, there's visible play between the rings and hub. When I was researching this, there was a post on a Vette forum where an engineer ran the wheel studs through a stress simulation - under normal loads they would defect a maximum of 0.4mm (and that's like hitting a bump with one wheel at speed). Basically there is no point in a hub centric ring/spacer if there's enough play to allow regular deflection anyway.

66.9mm may very well work. I don't want to post the specific part numbers of the spacers and hub rings I bought until I put everything on and make sure it all fits!

[crankaholic]

The wheels are finally installed

I'm still looking for someone to machine the hubs (of the wheels) so the OE studs that poke through the spacers will fit... so no spacers for now. The spacers fit perfectly on the hub though, so if anyone needs a quality set of spacers then get Eibach part # 90.4.15.027.2 (I got mine from summit racing). Bolt pattern is 5x120.65... but most people run wheels in that pattern on 5x120 without issues.







19x8.5" wheels with 245/45R19 tires fit and don't rub at all - even though the backspace (157mm) in the front is about all the car will take, rears can take a much larger wheel though.










The wheels fit better than I thought they would for a +35 offset... but I'm still going to get the spacers to fit. I think it'll push them out just right. I'll also have better pics tomorrow.